Add output orientation size helper

Summary:
In order to reduce code duplication add this helper
to AbstractOutput.

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D16794

abstract_output.cpp

@@ -59,10 +59,7 @@ QRect AbstractOutput::geometry() const
 
 QSize AbstractOutput::physicalSize() const
 {
-    if (m_orientation == Qt::PortraitOrientation || m_orientation == Qt::InvertedPortraitOrientation) {
-        return m_physicalSize.transposed();
-    }
-    return m_physicalSize;
+    return orientateSize(m_physicalSize);
 }
 
 int AbstractOutput::refreshRate() const
@@ -251,4 +248,12 @@ void AbstractOutput::initWaylandOutputDevice(const QString &model,
     m_waylandOutputDevice->create();
 }
 
+QSize AbstractOutput::orientateSize(const QSize &size) const
+{
+    if (m_orientation == Qt::PortraitOrientation || m_orientation == Qt::InvertedPortraitOrientation) {
+        return size.transposed();
+    }
+    return size;
+}
+
 }

abstract_output.h

@@ -171,6 +171,8 @@ protected:
 
     void setWaylandMode(const QSize &size, int refreshRate);
 
+    QSize orientateSize(const QSize &size) const;
+
 private:
     QPointer<KWayland::Server::OutputInterface> m_waylandOutput;
     QPointer<KWayland::Server::XdgOutputInterface> m_xdgOutput;

plugins/platforms/drm/drm_output.cpp

@@ -783,11 +783,7 @@ void DrmOutput::updateMode(int modeIndex)
 
 QSize DrmOutput::pixelSize() const
 {
-    auto orient = orientation();
-    if (orient == Qt::PortraitOrientation || orient == Qt::InvertedPortraitOrientation) {
-        return QSize(m_mode.vdisplay, m_mode.hdisplay);
-    }
-    return QSize(m_mode.hdisplay, m_mode.vdisplay);
+    return orientateSize(QSize(m_mode.hdisplay, m_mode.vdisplay));
 }
 
 void DrmOutput::setWaylandMode()